6

For better man-machine communication

Excellent Cab with Enhanced Functions Multi-Function LMI DisplayThe newly designed load moment indicator (LMI) sys-tem features a large, easy-to-read LCD display. The rated load, actual load, load ratio, and other information are displayed in large characters. Warnings and other items are displayed in color, and text messages and alarms alert the operator to prevent dangerous conditions from developing. Other information can also be displayed, including a rated load chart and rated load curve, in addition to a function that regulates the work-ing range.

The 7250 has a new cabin design with sash-less front and top glass that provides a panoramic frontward and skylight view. The glass also has less curvature to mini-mize distortion. The front up-per window has been broad-ened on both sides for a view that is 31% wider than a conventional cab, while the top-window view is wid-ened toward the rear.

Comfortable 940mm-Wide Cab Clear, Panoramic View

Multi-DisplayThe easy-to-read LCD multi display provides information on the current status of such functions as engine rpm, maintenance, and on-board trouble-shooting, so that the opera-tor has an ongoing, real-time as-sessment of the machine’s condi-tion at a glance.

Normal Displays• Engine speed (Lifting height*1) • Engine oil change interval• Reeving number for main/aux winch wire rope• Low-speed switch status• Wind speed*2

* 1 With the optional lifting height gauge installed* 2 With optional anemometer installed

Warning Displays• Warning (malfunction, maintenance information, etc.)• Self-diagnostic function (detects malfunctions in solenoid valves, sensors, etc.)

Direct control lever connection to Pilot valve for smooth operation.Control Levers Connected Directly to Pilot Valves for Smooth Operation

Air conditionerFully adjustable, high backed seat with a headrest and armrestsIntermittent wipers and window washersSun visor Roof blind

Visual comparison of new and conventional cabs

New cab

44º 42º

Conventional cab

• Over-load alarm display

• Working area display

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To ensure safe assembly and increase actual working hours

Excellent Transportabilityand Assembly

It is also possible to transport with boom base. The width and weight is within 3.4m and 44.5t. This eliminates installation of boom base and boom hoist rope in jobsite, swiftly ready for job.

The cab can be easily turned by hand toward the front of the machine during transporta-tion so that the up-per machinery fits within a width of 3.2m. This enables the machine with axles to be trans-ported on a trailer.

Boom Assembly/Disassembly ModeThe boom assembly/disassembly mode, which is used to release the over-hoist prevention function to facilitate boom assembly and disassembly, is activa-ted with a switch located under the multi-function LCD display of the load moment indicator (LMI). (This switch is different from the switch that releases the auto-stop functions for over-load and hook over-hoist.) When the boom is lifted to a certain angle, it is automatically deactivated and the LMI function is au-tomatically re-engaged to ensure that the boom as-sembly/disassembly function is used only when nee-ded.

Nesting Boom DesignThe tower insert jib can be easily nested in the insert boom by us-ing the optional stowing guide roll-ers. This reduces the number of trailers needed for transport and helps to minimize required stor-age space.

Light and Compact Super-Structures

Swing Cab

The boom hoist winch is pin-connected to upper structure for easy assembly and disassembly for transportation. The new and unique upper structure design provides the benefit of light and compact base machine good for transportation.

(1) Location of gantry compression-member foot.

(2) Complete separation of boom back-stops from upper structure.

Crane

Unique upper structure design

Base Machine Width of 3.2m (without Boom Base) and 3.4m (with Boom Base)

Transport with Boom Base

3,200mm

5,750mm

16,175mm

Gantry compression member

Boom back stops

3,400mm

3,400mm

8

Faster Attachment Assembly and DisassemblyA variety of new mechanisms greatly reduce the time nee-ded to assemble attachments. This results in lower labor and assist-crane costs, and greater productivity on the job.

Saving Storage and Transport Costs through the Common Use of Boom and JibThe 7250 features an innova-tive boom design to enhance lifting performance. The com-mon use of the boom and jib reduces labor when changing configurations and saves stor-age and transport costs.

The stowing bracket makes securely tighten the guy cables on to boom inserts for transporta-tion. This also ensures that the guy cables are correctly installed during assembly (optional).

The boom connector pin holder prevents the loss of boom connector pins during assembly/disassembly and transportation.

The rail for the luffing tower jib upper spreader, installed at the back of the insert boom, enables the spreader to move with-out the assist crane when assembling.

The foldable strut with a support makes easy as-sembly of strut on ground.

The upper spreader stowing guide makes it easy to connect guy cables.

e boom Tower jib

30' special insert boom for tower

Boom base

Insert boom

Tapered insert boom

Boom top

Tower insert jib

Tower jib top

Relay jib

Long boomFixed jib

Angle to the machine

Angle to the ground

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No compromise in KOBELCO’s safety policy

Safe, Environmentally-Conscious Two-Stage System to Prevent Boom and Jib Over-HoistsWith primary and secondary over-hoist prevention devi-ces, this new safety system can prevent boom over-hoist at two stages. The primary stop function is activated when the boom or tower approaches the critical angle-to-ground during hoisting. This new system monitors the an-gle-to-ground of the boom, tower or tower jib with a sen-sor, and swiftly alerts the operator of danger. For the tow-er, the angle-to-machine is also monitored at this stage. The secondary stop function uses a device that monitors the angle-to-machine of the boom, tower, or tower jib through a limit switch fitted to the boom and jib back-stops. It stops the machine automatically to prevent it from working outside of the safety range, and once acti-vated it cannot be cancelled.

Automatic Stop Release Switch with Safety FunctionThe automatic stop system prevents over-load, hook over-hoist and boom over-hoist. To deactivate the sys-tem, a two-stage release procedure is employed that uses a master key and separate switches. This makes it easy to supervise the use of the single key and pre-vent unauthorized release of the automatic stop sys-tem.

Automatic Soft-Stop Function Reduces ShocksThis function is activated automatically when boom or tower jib lowering, or boom hoisting is stopped by the over-load prevention system and over-hoist prevention system. It makes for a smooth stop and reduces danger-ous swinging of the load.

Other Safety FeaturesSwing flashers and warning buzzer warn surrounding workers when the machine is swinging.Function lock lever helps prevent accidental operation when the operator enters or leaves the cab.Directional markings on the crawlers make it easy to see which di-rection the crawlers will move.One-way call supports the safety of onsite personnel (optional).External lamp for over-load alarm notifies surrounding workers of the load condition (optional).Cameras and color monitor provide views of the rear of the ma-chine, the main and auxiliary winches, and the boom hoist winch (optional).

• Directional marking

• One-way call (optional)

• Function lock lever

10

DesignSide-Engine Layout forEasy MaintenanceA new engine layout on the side of the ma-chine provides easy access for routine in-spections and servicing. Maintenance crews can access the entire power plant just by opening the side door.

Super Fine Filter, a Long-Life Filter for Hydraulic Oil

• Super fine filter (glass fiber)

The large-capacity, super-fine filter is made of a high-performance filter medium consisting of glass fiber reinforced with steel wires. The replacement cycle is extended to four times longer than that of conventional filters to reduce lifelong operating costs.

Complying with Worldwide Exhaust Gas RegulationsAdopting the low pollution engine, the 7250 meets NRMM (Europe) Stage IIIA exhaust emissions regulations and U.S. EPA tier III.

Complying with Japanese Noise RegulationsThe 7250 is designed with advanced Kobelco low noise construction technologies, as specified by the Japanese Ministry of Land, Infrastructure and Transport.

Photomicrograph (x250)

• Conventional filter (paper fiber)

Crane Boom

Max. Lifting Capacity 250 t/4.6 m

Max. Length 76.2 m

Long Boom

Max. Lifting Capacity 37.5 t/14.4 m

Max. Length 91.4 m

Fixed Jib

Max. Lifting Capacity 22.7 t/15.0 m

Max. Combination 76.2 m + 30.5 m

Tower Jib

Max. Lifting Capacity 25 t/18.0 m

Max. Combination 64.1 m + 51.8 m

Tower Angle 60°~90°

Main & Aux. Winch

Max. Line Speed 110 m/min (1st layer)

Rated Line Pull (Single Line) 132 kN {13.5 tf}

Wire Rope Diameter 28 mm

Wire Rope Length 390 m (Main) 220 m (Aux.)

Brake Type Spring-set hydraulically released (Negative)

Free-Fall Brake Type Wet-type multiple disc brake (Optional)

Working Speed

Swing Speed 2.2 min-1 {rpm}

Travel Speed 1.1/0.7 km/h

Power Plant

Model Hino P11C-UN

Engine Output 247 kW/2,000 min-1 {rpm}

Fuel Tank Capacity 400 liters

Hydraulic System

Main Pumps 4 variable displacement

Max. Pressure 31.9 MPa {325 kgf/cm2}

Hydraulic Tank Capacity 600 liters

Weight

Operating Weight* Approx. 211 t

Ground Pressure* 122 kPa {1.25 kgf/cm2}

Counterweight 97.1 t (Upper), 20.0 t (Lower)

Transport Weight** 44.5 t

* Including upper and lower machine, 97.1 ton counterweight and 20.0 ton carbody weight, basic boom, hook, and other accessories.**Base machine with boom base, carbody, gantry, trans-lifter, lower spreader, upper spreader, main and aux. winches including wire rope, and boom hoist winch including wire rope.Units are SI units. { } indicates conventional units.

General Dimensions (Unit:mm)

Main Specifications (Model: 7250-2F)

17-1, Higashigotanda 2-chome, Shinagawa-ku, Tokyo, 141-8626 JAPANTel: +81-3-5789-2130 Fax: +81-3-5789-3372

Inquiries To:

Note: This catalog may contain photographs of machines with specifications, attachments and optional equipment not certified for operation in your country.Please consult KOBELCO for those items you may require. Due to our policy of continual product improvements all designs and specifications are subject tochange without advance notice.Copyright by KOBELCO CRANES CO., LTD. No part of this catalog may be reproduced in any manner without notice.

Bulletin No. 7250-2F-AO1 060901F Printed in Japan

KOBELCO is the corporate mark used by Kobe Steel on a variety of products and in the names of a number of Kobe Steel Group companies.

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